staging: wilc1000: join_req can be static

Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/wilc1000/host_interface.c

@@ -255,7 +255,7 @@ static u8 get_ip[2][4];
 static u32 inactive_time;
 static u8 del_beacon;
 
-u8 *join_req;
+static u8 *join_req;
 u8 *gu8FlushedInfoElemAsoc;
 u8 gu8Flushed11iMode;
 u8 gu8FlushedAuthType;